Ship&#39;s log



R. STAR SHI'PS LOG Sept. 6, 1927.

Filed June 29. 1926 2 Sheets-Sheet l a aoooen o joo ooooano ATTORNEYSWITNESSES Patented Sept. 6, 1927.

PATENT OFFICE.

RICHARD STAR, OF BROOKLYN, NEW YORK.

SHIPS LOG.

, A Application filed June 29.

This inventionrelates to ships logs and has for an object to provide animproved construction wherein there is presented a minimum number ofmoving parts while a substantially accurate reading is secured atalltimes'and atdiiferent speeds.

;Another object of the invention is to provide an improved actuatorstructure wherein the power transmitting cable is connected by a singlelever with the actuating piston.

-A further object, more specifically, is to provideina ships logactuator a lever struc ture, andmeans for moving, the same withthepartsso arranged thatpacking iseliminated while the effective lengthof the lever may bevaried as desired. In the accompanying drawingsFigure 1 is an elevation with certain parts in section showing acomplete ships log including the. indicator and actuator. l

' Figure 2 is a vertical sectional view through the Pitot tube anda'ssociatedparts shown in Figure 1.

Figure 3 is a longitudinal vertical sectional view through the actuatorshown in Figure 1. Figure 4 isan ,end view of the actuator shownirrFigure 3.

uRefer'ring to the accompanying drawings by numerals, 1 indicatesthe'bottom of a ship on which the device is mounted. cated in Figure 1,an aperture 2 is formed in thebottom 1 and connected with the bottom 1inany suitable manner is a valve 3 which covers aperture 2. Valve'3 isof special construction and is provided with a bore 4 sufliciently largeto permit the 'Pitot tube 5 to extend therethrough and still leave aspace for the passage of water tothe pipe 6.

" Whenever the Pitot tube 5 is removed, the

' handle 7 is rotated and the valve 3 is closed.

The tube Ginaybe flexible if desired though ordinarily it isian ordinarypipe used on shipsan d at the end opposite that associated with valve 3it isconnected to-the bottom of an actuating cylinder 8. A pipe 9 leadsfrom near. the top of the actuatingcylinder 8 and v is connected tothePitot tube 5 through a flexible 'connection 10. As indicatedin Figure3, the actuator cylinder 8 is divided into a lower compartment 11 and anupper compart-ment 12 by the p1ston'13 and the diaphrag1n 14. suitablevalve 1 5 is connected As indi 1926. Serial No. 119,562. .1

to the upper end of cylinder 8 so as to exhaustchamber 12 of air and avalve 16 is connected to the bottom of cylinder 8 to ex through pipe 6into chamber 11. When water flows into chamber 12the air is exhaustedout of valve 15. As soon as water begins to pass out of these valves,the workman will then close the valves and the device is theninoperative condition. Before chamber 11- completely fills, the casing19carrying lever 20 is filled with water and also the pipe 21 is filledwith Water up to the water level ext-eriorly of the ship.- Pipe '21,casing 19 and chamber 11 are all supplied with water un'der the usualhydrostatic head produced by the depth at which these devices areplaced. The

chamber 12 is also filled in the same manner but'when the ship begins tomove forwardly,

the Pitot tube .which faces forwardly will begin to function andadditional water will be. forced into chamber 12 under pressure. Thisadditional water will begin to move piston 13 downwardly and therebyexpel some of the water from chamber'll. amount of downward movement ofthe-piston 13 varies with the amount ofpressure ex-- The erted thereonby the incoming water which is in proportion to the speed of the ship.

As both sides of the piston 13 are under pres sure equal to thehydrostatic head ofjwater, a slightincrease of pressure in chamber 12will produce a movement of the piston 13 in proportion tothis'additionalpressure. This results in causing the instrument to be very.

sensitive and also very accurate at low speeds as well as hlghspeeds. I

The casing 19 is preferably rectangular,

though it could be round or any desired shape as the same merely is anenclosure for receivingthelev-er 20 which is connectedat one end withthe cableo'r rod 22. This cable orrod extends upwardly and sometimesover pulleysuntil reaches theindicator 23. The indicator 23'may be ofany approved kind, as for I instance, that shown in one of my with saidpiston and extending into the casing, said piston being operativelyconnected With said lever for actuating the lever in one direction, anda pair of pipes for directing thewater from the bottom of the shipcarrying the actuator to opposite ends ofsaid cylinder respectively onepipe having the ton will be moved in proportion to the speed 10 V a ofthe ship and said lever will be actuated also in proportion to the speedof the ship.

RICHARD STAR. s

